Having problem with 5th gear (OD) Bike slows down but engine revs up very high. Whne the engine is cold just starting out no problem about 5 minutes later while in OD the throttle become useless due to the bike start slowing down no matter how much the throttle is pressed. Shift bdown to 4th gear no prob lem, shift back to OD (5th gear) same problem.
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Brian's suggestion sounds good. If you bought this bike new and it has done this since day one, then it's possible (but quite unlikely) that the manufacturer put the wrong oil in the engine/transmission and it's too thin to do its job. If you bought it used, I would say that the clutch is going bad.
Start bike, while sitting still put it in 3rd or 4th gear . WHILE KEEPING PRESSURE ON THE REAR BRAKE, SLOWLY let out the clutch with a little throttle, if the bike does not stall out the clutch is bad.
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